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[parameter] Parameter-Enabled Class Templates: combining keyword and deduction for the same parameter
by Joaquín Mª López Muñoz 28 Jul '07

28 Jul '07

The docs explain that a parameter can be named: typedef parameter::parameters< required<tag::threading_policy> ... > class_signature; ... class_<threading_policy<single_threaded>,...>; or else be deduced: typedef parameter::parameters< required< deduced<tag::threading_policy>, is_base_and_derived<threading_policy_marker,_> > ... > class_signature; ... class multithreaded: threading_policy_marker{...}; class_<multithreaded,...>; Now, is it possible to combine these two options into one, so that the the two syntaxes class_<threading_policy<single_threaded>,...>; class_<multithreaded,...>; are accepted? If so, how? Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo

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Program Options: parse_config_file: How to ignore unknown options?
by Olaf van der Spek 28 Jul '07

28 Jul '07

Hi, How do I tell this function to ignore unknown options?

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Boost Threads and Cancel Method
by Jeffery Cavallaro 27 Jul '07

27 Jul '07

Per the C++0x discussions earlier in the week, and the calls for the Bjarne, et al to make some definitive decisions regarding a threading API, I would ask the Boost thread developers not to wait and please add a cancel method now. A lot of the scheduling priority stuff can wait, but it is going to be real hard to turn people from pthreads until some sort of a cancel method, however basic, is available. I believe that this is the state of things; however, it not, someone please feel free to correct me. Jeffery Cavallaro Postini Engineering 650-486-8342 ----------------------------------------------------------- This message may contain confidential and/or privileged information. This information is intended to be read only by the individual or entity to whom it is addressed. If you are not the intended recipient, you are on notice that any review, disclosure, copying, distribution or use of the contents of this message is strictly prohibited. If you have received this message in error, please notify the sender immediately and delete or destroy any copy of this message.

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program_options: documentation dead end
by Steven Mackenzie 27 Jul '07

27 Jul '07

I am trying to understand composing, multitoken and zero_tokens methods of the typed_value class. This link http://www.boost.org/doc/html/boost/program_options/typed_value.html#id6986… is to the composing method from the reference page for the typed_value class: it suggests looking at the is_composing documentation, which is unfortunately empty. Can this be fixed for Boost 1.34.1? Also, can someone explain to me what the multitokens method does. The doc states "Specifies that the value can span multiple tokens." What is the definition of a token here? Finally, what does zero_tokens() do? Thanks in advance Steven

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[Important] Boost moving to Subversion on Tuesday, July 31st
by Doug Gregor 27 Jul '07

27 Jul '07

============================================= Boost will be moving to Subversion on Tuesday, July 31st. ============================================= === What's happening === We are converting the existing Boost CVS repository, hosted by SourceForge, over to Subversion. The contents of the CVS repository will join the Boost sandbox and (beta) web site in the Boost Subversion repository, hosted by the Open Systems Laboratory at Indiana University. === Timeline === At 8:00 AM EDT on Tuesday, July 31, we will be cutting off access to the current Boost CVS repository. The Boost Subversion repository, mailing list archives, Boost Trac, beta.boost.org, and anything else hosted at OSL will also be unavailable during this time. We expect to have everything back online by midnight Tuesday. I will send another note to the mailing lists when the conversion is complete. The mailing lists and the main Boost web site should still work during this time. === What you should do === If you have any outstanding changes to Boost in your local CVS tree, commit them before 8:00am EDT on Tuesday. Any changes to your local CVS tree that have not been committed to CVS will be lost and will have to manually be moved over Subversion. The Boost CVS repository will not be reopened. If you have not done so yet, familiarize yourself with Subversion, read the Boost Trac page about the Boost Subversion repository, and, if you have write access to CVS, request a Subversion account: http://svn.boost.org/trac/boost/wiki/BoostSubversion === Who's in charge? === I will be the primary contact person for questions about and problems with the Boost Subversion repository. Most questions should be directed to the Boost mailing list. Account requests should go to all of the moderators at boost-owner(a)lists.boost.org. === How you can help === In several Boost tools and many places in Boost's documentation, we refer to the Boost CVS repository. We need help upgrading these tools and fixing the documentation to refer to the Boost Subversion repository. Specifically: * regression.py, used by regression testers, must be updated to use Subversion * Various developer and release-manager documentation talks about Boost's CVS, but should now refer to Subversion. Better yet: migrate this documentation over to the Boost Trac, where it is easier to maintain and update, and won't be a part of the Boost distribution * Write Subversion-specific documentation on the Trac. Quick-start guides, tips and tricks, etc. would be helpful. One particularly important bit: using svnmerge.py to simplify the handling of release branches. Doug Gregor Open Systems Lab @ Indiana University

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portable lock-free reference counting
by Bryan Green 27 Jul '07

27 Jul '07

Hello, I have a class that contains a reference count. I would like to maintain the count without using a mutex. Can anyone recommend a way to do this portably, using Boost? I see the needed mechanics in 'detail/sp_counted_base.hpp', but since it's in 'detail', I'm not sure what the most portable (and maintainable) way to use it is. Thanks, -Bryan

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boost 1.34.1 cygwin build error.
by chun ping wang 27 Jul '07

27 Jul '07

I change user-config.jam to add "using python : : /usr/bin/python2.5 ;" $ ./bjam --toolset=gcc --prefix=/usr/boost-install install Building Boost.Regex with the optional Unicode/ICU support disabled. Please refer to the Boost.Regex documentation for more information (don't panic: this is a strictly optional feature). /usr/src/boost_1_34_1/tools/build/v2/tools/stage.jam:424: in object(installed-sh ared-lib-generator)(a)4.run *** argument error * rule virtual-target.register ( target ) * called with: ( object(file-target)@1396 object(file-target)@1397 ) * extra argument object(file-target)@1397 /usr/src/boost_1_34_1/tools/build/v2/build/virtual-target.jam:880:see definition of rule 'register' being called /usr/src/boost_1_34_1/tools/build/v2/build/generators.jam:840: in try-one-genera tor-really /usr/src/boost_1_34_1/tools/build/v2/build/generators.jam:902: in try-one-genera tor /usr/src/boost_1_34_1/tools/build/v2/build/generators.jam:1110: in construct-rea lly /usr/src/boost_1_34_1/tools/build/v2/build/generators.jam:1186: in generators.co nstruct /usr/src/boost_1_34_1/tools/build/v2/tools/stage.jam:160: in construct /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:1242: in object(install-t arget-class)(a)85.generate /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:765: in generate-really /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:738: in object(main-targe t)(a)246.generate /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:895: in targets.generate- from-reference /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:1169: in generate-depende ncies /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:1214: in object(alias-tar get-class)(a)89.generate /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:765: in generate-really /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:738: in object(main-targe t)(a)248.generate /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:895: in targets.generate- from-reference /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:1169: in generate-depende ncies /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:1214: in object(alias-tar get-class)(a)97.generate /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:765: in generate-really /usr/src/boost_1_34_1/tools/build/v2/build/targets.jam:738: in object(main-targe t)(a)252.generate /usr/src/boost_1_34_1/tools/build/v2/build-system.jam:402: in load /usr/src/boost_1_34_1/tools/build/v2/kernel/modules.jam:261: in import /usr/src/boost_1_34_1/tools/build/v2/kernel/bootstrap.jam:132: in boost-build /usr/src/boost_1_34_1/boost-build.jam:9: in module scope

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Creating an equivalent to java's System.currentTimeMillis
by Philippe Mondon 27 Jul '07

27 Jul '07

Hi, I'm trying to build an equivalent to java's System.currentTimeMillis() using boost framework, and I've done something like that : #include <boost/date_time/posix_time/posix_time.hpp> using namespace boost::gregorian; using namespace boost::posix_time; //.... Other code long Utils::getCurrentTime() { ptime now(microsec_clock::universal_time()); date d(1970,boost::date_time::Jan,01); ptime torigin(d); //midnight //time_duration tduration = now - torigin; time_period tperiod(torigin,now); //long returnVal = tduration.total_milliseconds(); long returnVal = tperiod.length().total_milliseconds(); cout << "Current time : " << returnVal << endl; return returnVal; } Unfortunately, it gives only a 8 digit number (in java you've got a 13 digit number when using currentTimeMillis) so I suspect that it does not give a duration since Jan the 1st 1970 (which is java reference). Do you have an idea of how to achieve the writing of this piece of code? Thanks, regards. Philippe Mondon Equipe PAC/Architecture DIMC Calyon Ce message et ses pièces jointes (le "message") est destiné à l'usage exclusif de son destinataire. Si vous recevez ce message par erreur, merci d'en aviser immédiatement l'expéditeur et de le détruire ensuite. Le présent message pouvant être altéré à notre insu, CALYON Crédit Agricole CIB ne peut pas être engagé par son contenu. Tous droits réservés. This message and/or any attachments (the "message") is intended for the sole use of its addressee. If you are not the addressee, please immediately notify the sender and then destroy the message. As this message and/or any attachments may have been altered without our knowledge, its content is not legally binding on CALYON Crédit Agricole CIB. All rights reserved.

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[interprocess] Problems on Mac OS X 10.4
by Mark A. Thalman 27 Jul '07

27 Jul '07

We are using the boost interprocess library for some cross-platform interprocess communication. It seems to be working fine on Windows but we are having some issues on the Mac OS (10.4.10, using gcc 4). One thing is that the remove call always deletes the shared memory file, regardless of whether the other process is using it. Does anyone know if this has been tested? Also, the only version I can find is in CVS. Is this where I should be getting the source from, or is there an "official" release somewhere? -- Mark

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[statechart] completion event
by Francisco Santos 27 Jul '07

27 Jul '07

Dear Mr. Andreas Huber, Are completion transitions and events supported by the Statechart Boost library? If so, how do you recommend they should be implemented in code. I have not found examples of statemachines containing transitions *without* explicit triggers in your library's doc page (http://www.boost.org/libs/statechart/doc/index.html) Thank you, Francisco Santos PS: I have included the definition of a completion transition and completion event for reference: A completion transition is a transition without an explicit trigger, although it may have a guard defined. When all transition and entry actions and activities in the currently active state are completed, a completion event instance is generated. This event is the implicit trigger for a completion transition. The completion event is dispatched before any other queued events and has no associated parameters. For instance, a completion transition emanating from a concurrent composite state will be taken automatically as soon as all the concurrent regions have reached their final state. If multiple completion transitions are defined for a state, then they should have mutually exclusive guard conditions. [1] "Completion transitions and completion events", p. 144, Unified Modeling Language Specification, v1.4.2, 2004

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